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VT8231 Datasheet(PDF) 27 Page - List of Unclassifed Manufacturers |
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VT8231 Datasheet(HTML) 27 Page - List of Unclassifed Manufacturers |
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27 / 132 page  VT8231 Preliminary Revision 0.8 October 29, 1999 -21- Pinouts 7HFKQRORJLHV ,QF :H &RQQHFW :H &RQQHFW Conventional BIOS ROM / ISA Bus Interface Signal Name Pin # I/O Signal Description LA21 / USBOC3# / GPO21 LA20 / USBOC2# / GPO20 Y13 W13 O System Address Bus. Allows access to physical memory devices (e.g., BIOS ROMs) up to 4 Mbytes. SA[19:18], SA17 / strap, SA16 / strap, SA[15:0] / SDD[15:0] V13, U13, T13, Y14, W18, V17, Y17, W16, V15, Y15, W14, T15, U15, U16, V14, W15, Y16, V16, W17, Y18 IO System Address Bus. These address lines are used to interface to BIOS ROMs but may also be used to implement a subset of the ISA bus if required. SA[19-16] are connected to ISA bus SA[19-16] directly. SA[19-17] are also connected to LA[19-17] of the ISA bus. SD15 / LGNT2# / GPO11, SD14 / LREQ2# / GPI13, SD13 / LGNT1# / GPO10, SD12 / LREQ1# / GPI12, SD11 / HGNT2# / GPO9, SD10 / HREQ2# / GPI11, SD9 / HGNT1# / GPO8, SD8 / HREQ1# / GPI10, SD7, SD6, SD5, SD4, SD3, SD2, SD1, SD0 V10 W10 Y10 U10 T10 V11 W11 Y11 T11 R11 U11 U12 Y12 W12 V12 R12 IO / O / O IO / I / I IO / O / O IO / I / I IO / O / O IO / I / I IO / O / O IO / I / I IO IO IO IO IO IO IO IO System Data. SD[15:0] provide the data path for BIOS ROMs and for devices residing on the ISA bus. SD0-7 also output general purpose output information when GPOWE# is active. IOR# / GPO22 U7 IO I/O Read. IOR# is the command to an ISA I/O slave device that the slave may drive data on to the ISA data bus. IOW# / GPO23 T7 IO I/O Write. IOW# is the command to an ISA I/O slave device that the slave may latch data from the ISA data bus. MEMR# W9 IO Memory Read. MEMR# is the command to a memory slave that it may drive data onto the ISA data bus. MEMW# Y9 IO Memory Write. MEMW# is the command to a memory slave that it may latch data from the ISA data bus. IRQ1 / MSCK N2 I / IO Interrupt 1 (optional external Keyboard Controller). IRQ8# / GPI1 V3 I / I Interrupt 8 (optional external RTC). IRQ12 / MSDT N4 I / IO Interrupt 12 (optional external PS2 Mouse Controller). IRQ14 T14 I Interrupt 14 (IDE Primary Channel). IRQ15 U14 I Interrupt 15 (IDE Secondary Channel). SPKR U9 O Speaker Drive. Output of internal timer/counter 2. Serial IRQ Signal Name Pin # I/O Signal Description SERIRQ V9 I Serial IRQ (Rx68[3] = 1 and Rx74[6] = 0) |
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